From the Maxum manual:
User Code Re-programming Sequence
1.Enter 4 digit user code.
2.Press the 1 and 4 button simultaneously. The unlockLED will blink if the correct code was entered.
3.Enter a new 4 digit user code followed by thestart button.
4.Repeat step 3. The unlock LED will light steadilyand the system will be in accessory mode.
Here's the link if you want to copy and paste it in your browser, which also includes complete directions for the Keyless Ignition Engine Starting / Stopping procedures.
https://www.manualslib.com/manual/80...k.html?page=15